package handler;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

/**
 * 继承ChannelINboundHNadlerAdapter,定义响应入站事件的方法。
 */
public class EchoServerHandler extends ChannelInboundHandlerAdapter{


    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf in = (ByteBuf) msg;
        // 将消息记录到控制台
        System.out.printf("server received:" + in.toString(CharsetUtil.UTF_8));
        // 将接受到的消息写给发送者，而不冲刷出站消息
        ctx.write(in);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
//        super.channelReadComplete(ctx);
        // 把未决消息冲刷到远程节点，并且关闭该channel
        ctx.writeAndFlush(Unpooled.EMPTY_BUFFER)
                .addListener(ChannelFutureListener.CLOSE);

    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
//        super.exceptionCaught(ctx, cause);
        cause.printStackTrace();
        // 关闭channel
        ctx.close();
    }
}
